CONTROL CIRCUIT FOR FAN AND ELECTRONIC SYSTEM UTILIZING SAME
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United States of America Patent
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N/A
Issued Date -
Nov 24, 2016
app pub date -
Jul 21, 2015
filing date -
Jul 21, 2015
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A control circuit for a fan of an electronic system includes a temperature sensor detecting temperature in the electronic system, a connector electrically coupled to the fan, and a control chip electrically coupled to the temperature sensor and the connector to obtain instant temperature and rotational speed. Through the connector, the control chip outputs a first pulse width modulation (PWM) signal configured to adjust duty ratio of the first PWM signal. An amplitude adjustment unit electrically coupled to the control chip is configured to adjust amplitude of the first PWM signal to output a second PWM signal, and an inverting unit electrically coupled to the connector and the amplitude adjustment unit reverses the second PWM signal to output a third PWM signal to the fan, through the connector, to control the rotational speed of the fan.
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